AC / Anti-lock brake light issue

[CWARE]

When I got my 2 door 95 Tahoe 4wd the AC panel worked when it wanted to and I soon replaced it with a new panel as I read the stock 95 panels had many issues. The AC worked fine afterwards until last week. My wife was driving it and told me the AC had stopped working with no blower sound or air (hot or cold) coming from the vents. Later that day I checked it out hoping it was a fuse or something simple and no luck. All fuses looked fine. I then noticed that the ABS light was on in the dash. I remembered that months ago (can’t recall if it was before or after the new panel went in) the AC panel did the same thing and that the ABS light was on then also. I thought there was no way the two could be related but the next day the light was off and the AC panel worked fine.

I did some searching on the ABS light and saw some saying it could of course be the controller and some saying it could be a speed sensor at one of the wheels. Has anyone had this issue with the ABS light and AC panel being connected in some way or is this just one heck of a coincidence in my situation? Any help would be appreciated. Thanks.


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[Big Mama]

Can you read the abs code?

 

[CWARE]

I don’t have a scanner capable of running an OBD1 system.


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[Big Mama]

Ah forgot about that. I’m not great on that gen let’s get some help @swathdiver @iamdub @SnowDrifter @HiHoeSilver @Galante fellas?

 

[swathdiver]

Sorry, I'm not familiar with those. But a bi-directional scan tool is essential to properly diagnose and fix it without throwing parts at it.

 

[TheAutumnWind]

You can pull obd1 codes with a paper clip or an aldl cable and a laptop

 

[CWARE]

I’m familiar with the method of pulling an OBD1 code using the paper clip or code key but will there be a code to read if the actual check engine light isn’t on?


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[TheAutumnWind]

Is your abs rear wheel only?

 

[TheAutumnWind]

I don't recall if a '95 just has rear anti lock or 4 wheel anti lock. If it's rear wheel only, dollars to pesos says it's the RWAL sensor. It's mounted on top of the diff, held on by one bolt, and has a tendency to stick/break off. If it's 4 wheel, then you REALLY need to pull codes as there are three wheel speed sensors to contend with, as well as the ABS unit itself.

 

[TheAutumnWind]

I’m familiar with the method of pulling an OBD1 code using the paper clip or code key but will there be a code to read if the actual check engine light isn’t on?


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You can try unplugging the abs box for a day or so and see if it resets. Or just delete ABS altogether which alot of people do on the Rear wheel only abs trucks.

If you have an abs light there is likely an abs code. WHy would you need to "check engine" if there is nothing wrong with the engine?

OBD-I ABS codes:
Code 21: right front speed sensor or circuit open
Code 22: missing right front speed signal
Code 23: erratic right front speed signal
Code 25: left front speed sensor or circuit open
Code 26: missing left front speed signal
Code 27: erratic left front speed signal
Code 29: simultaneous drop out of front speed sensors
Code 35: vehicle speed sensor or open circuit
Code 36: missing vehicle speed sensor signal
Code 37: erratic vehicle speed sensor signal
Code 38: wheel speed error
Codes 41 through 54: control valves
Codes 61 through 63: reset switches
Codes 65 & 66: open or shorted pump motor relay
Code 67: open motor circuit or shorted BPMV output
Code 68: locked motor or shorted motor circuit
Codes 71 through 74: memory errors
Code 81: brake switch circuit shorted or open
Code 86: shorted abs indicator lamp
Code 87: shorted brake warning lamp